Walsh accepts he has come full circle from Poland.
"That was my first breakthrough performance. Hopefully I can get things rolling at this one," he said. "There's no reason I can't throw well."
Walsh has overcome the hip injury which curtailed his progress earlier this year.
"A championship format is different, there's a lot on the line," his coach Dale Stevenson said. "[For instance] the All Blacks can play as many tests as they want, but until you get to the World Cup, they don't count for much. For us this year, it's not about going [to Rio] to get the tracksuit and coming home."
No New Zealand man has earned an Olympic shot put medal - Les Mills finished seventh at Tokyo in 1964 - and Walsh was the first Kiwi male to earn a medal in 15 editions of the world indoor championships.
The 24-year-old finished fourth at the world outdoor championships in 2015 but beat every major international competitor across the season. He also became the first New Zealand man to win a Diamond League meet, in Brussels, and set a 21.62m personal best in Zagreb.
Last year, Walsh stated one of his biggest challenges before heading overseas was "trying to stay like a normal Kiwi bloke". He had gone from a builder who competed for enjoyment, to being a thrower who enjoyed building.
This year, he will spend further time away from his Christchurch home with a decent stint in the United States. He leaves for Rio from the University of Georgia in Athens, home to former world champion Reese Hoffa. He will also train with fellow American throwers Ryan Whiting and Jordan Clarke.